First off, I have tried to look for a solution on a number of forums, but to no avail. I migrated from 09 to 11 late last year some time with no issues. I now have about 35,000 pictures and recently added a further 2000 in a couple of new events. However, over the last couple of weeks I lost photobooks I had made and I realised that some of the events either dissapeared altogether or pictures previously in that event dissapeared from the gallery. The pictures are still in the respective directory and are NOT deleted, but no longer visible either in "photographs" or "events". I have tried rebuilding the library through the iphoto application (alt + cmd) and with the help of the library manager tool, none of which did the trick. I added an event a couple of days ago, about 50 pictures, which now has dissapeared and it is starting to get to me. If I use time machine to go back a couple of days and restore, will I loose the changes that were done in the meanwhile? I have seen similar problems with iphoto11, but not like this, this is starting to feel like windows allover again!